1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10
11// template<class R, class F>
12// transform_view(R&&, F) -> transform_view<views::all_t<R>, F>;
13
14#include <cassert>
15#include <concepts>
16#include <ranges>
17#include <utility>
18
19struct PlusOne {
20 int operator()(int x) const;
21};
22
23struct View : std::ranges::view_base {
24 int *begin() const;
25 int *end() const;
26};
27
28struct Range {
29 int *begin() const;
30 int *end() const;
31};
32
33struct BorrowedRange {
34 int *begin() const;
35 int *end() const;
36};
37template<>
38inline constexpr bool std::ranges::enable_borrowed_range<BorrowedRange> = true;
39
40void testCTAD() {
41 View v;
42 Range r;
43 BorrowedRange br;
44 PlusOne f;
45
46 static_assert(std::same_as<
47 decltype(std::ranges::transform_view(v, f)),
48 std::ranges::transform_view<View, PlusOne>
49 >);
50 static_assert(std::same_as<
51 decltype(std::ranges::transform_view(std::move(v), f)),
52 std::ranges::transform_view<View, PlusOne>
53 >);
54 static_assert(std::same_as<
55 decltype(std::ranges::transform_view(r, f)),
56 std::ranges::transform_view<std::ranges::ref_view<Range>, PlusOne>
57 >);
58 static_assert(std::same_as<
59 decltype(std::ranges::transform_view(std::move(r), f)),
60 std::ranges::transform_view<std::ranges::owning_view<Range>, PlusOne>
61 >);
62 static_assert(std::same_as<
63 decltype(std::ranges::transform_view(br, f)),
64 std::ranges::transform_view<std::ranges::ref_view<BorrowedRange>, PlusOne>
65 >);
66 static_assert(std::same_as<
67 decltype(std::ranges::transform_view(std::move(br), f)),
68 std::ranges::transform_view<std::ranges::owning_view<BorrowedRange>, PlusOne>
69 >);
70}
71

source code of libcxx/test/std/ranges/range.adaptors/range.transform/ctad.compile.pass.cpp